Several big firms, among them Saudi Arabian Airlines and the National Iranian Steel Corporation, have been omitted because verifiable results were not available.

ECONOMIST: A new ranking of Muslim firms

Additionally, most Middle East air carriers, including Turkish Airlines, Royal Jordanian Airlines, Saudi Arabian Airlines and Emirates Airlines, have not discontinued service so far.

BBC: Navigating the traveller exodus out of Egypt

This month in Tehran, Iran's capital, government-orchestrated crowds of students hurled Molotov cocktails at the offices of Saudi Arabian Airlines, attacked Egypt's diplomatic mission and called for Mr Mubarak's execution as a traitor.

ECONOMIST: Egypt and Gaza